One week after shooter Stephen Paddock executed the deadliest mass shooting in modern U.S. history at a Las Vegas country music festival, four first responders are speaking out about what they witnessed that day. In a new episode of “60 Minutes,” Detectives Casey Clarkson and Matthew Donaldson, Officers Joshua Bitsko and Dave Newton and SWAT team member Levi Hancock described the harrowing scene they encountered after storming Paddock’s 32nd-floor Mandalay Bay hotel room on October 2. Eventually, the team was able to zero in on room 159 after a hotel-security guard named Jesus Campos reported that he saw about 200 rounds fired into the hallway from behind Paddock’s door.